Shot, devices, and installations for ultrasonic peening, and parts treated thereby

Abstract

Shot for use in a peening installation, the shot having: hardness greater than or equal to 800 HV; density greater than or equal to 8 g/cm 3 ; and pieces having a maximum dimension less than or equal to 1.5 mm.

1. A method for treating a part comprising a hole, the hole extending along an axis, the method comprising:
 forming a treatment chamber by: 
 inserting a deflector at least partially into the hole, the deflector comprising a surface having an angle oblique to the axis, 
 positioning a vibrating surface of a sonotrode outside and in proximity to the hole; and 
 projecting at least one piece of shot set in motion by the vibrating surface of the sonotrode toward the deflector. 
 
     
     
       2. A method according to  claim 1 , wherein the hole is a through hole. 
     
     
       3. A method according to  claim 1 , wherein the hole has a circular cross-section. 
     
     
       4. A method according to  claim 1 , wherein the vibrating surface extends perpendicularly to the axis of the hole. 
     
     
       5. A method according to  claim 1 , wherein the deflector is configured to direct the at least one piece of shot towards a surface associated with the hole. 
     
     
       6. A method according to  claim 1 , wherein the deflector is of conical shape. 
     
     
       7. A method according to  claim 1 , wherein the deflector is configured for reducing an angle of incidence of the at least one piece of shot against the surface of the hole. 
     
     
       8. A method according to  claim 1 , wherein the hole is a blind hole. 
     
     
       9. A method according to  claim 1 , wherein the hole is a tapped hole. 
     
     
       10. A method according to  claim 1 , wherein the deflector is caused to move relative to the hole during treatment. 
     
     
       11. A method according to  claim 1 , wherein the deflector is caused to rotate relative to the hole around the axis of the hole during treatment. 
     
     
       12. A method according to  claim 1 , wherein the hole opens out on first and second opposite faces of a part to be treated, and wherein the treatment chamber extends over a portion of at least one of the first and second faces so as to expose the portion to the at least one piece of shot. 
     
     
       13. A method according to  claim 12 , wherein the first and second faces are at least partially exposed to the at least one piece of shot. 
     
     
       14. A method according to  claim 5 , wherein the deflector is fully inserted in the hole. 
     
     
       15. A method according to  claim 1 , wherein the sonotrode is located in front of one end of the hole. 
     
     
       16. A method according to  claim 1 , wherein the hole is located in a part having a flattened shape. 
     
     
       17. A method according to  claim 16 , wherein the axis of the hole is perpendicular to a surface of the part. 
     
     
       18. A method according to  claim 1 , wherein the at least one piece of shot has a hardness equal to or greater than 800 HV. 
     
     
       19. A method according to  claim 1 , wherein the at least one piece of shot comprises tungsten carbide.